The name witch in witch-hazel has its origins in Middle English wiche, from the Old English wice, meaning "pliant" or "bendable", and is not related to the word witch.
Witch-Hazel

Ruth Hartnup [CC BY 2.0] via Flickr
The name witch in witch-hazel has its origins in Middle English wiche, from the Old English wice, meaning "pliant" or "bendable", and is not related to the word witch.